| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: pixie-common.c,v 1.1 1999/12/22 15:58:41 mdw Exp $ |
| 4 | * |
| 5 | * Common code for Pixie client and server (Unix-specific) |
| 6 | * |
| 7 | * (c) 1999 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of Catacomb. |
| 13 | * |
| 14 | * Catacomb is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU Library General Public License as |
| 16 | * published by the Free Software Foundation; either version 2 of the |
| 17 | * License, or (at your option) any later version. |
| 18 | * |
| 19 | * Catacomb is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU Library General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU Library General Public |
| 25 | * License along with Catacomb; if not, write to the Free |
| 26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 27 | * MA 02111-1307, USA. |
| 28 | */ |
| 29 | |
| 30 | /*----- Revision history --------------------------------------------------* |
| 31 | * |
| 32 | * $Log: pixie-common.c,v $ |
| 33 | * Revision 1.1 1999/12/22 15:58:41 mdw |
| 34 | * Passphrase pixie support. |
| 35 | * |
| 36 | */ |
| 37 | |
| 38 | /*----- Header files ------------------------------------------------------*/ |
| 39 | |
| 40 | #include <errno.h> |
| 41 | #include <stddef.h> |
| 42 | #include <stdio.h> |
| 43 | #include <stdlib.h> |
| 44 | #include <string.h> |
| 45 | |
| 46 | #include <sys/types.h> |
| 47 | #include <unistd.h> |
| 48 | #include <fcntl.h> |
| 49 | #include <termios.h> |
| 50 | #include <pwd.h> |
| 51 | |
| 52 | #include <sys/socket.h> |
| 53 | #include <sys/un.h> |
| 54 | |
| 55 | #include <mLib/alloc.h> |
| 56 | #include <mLib/dstr.h> |
| 57 | |
| 58 | #include "pixie.h" |
| 59 | |
| 60 | /*----- Main code ---------------------------------------------------------*/ |
| 61 | |
| 62 | /* --- @pixie_address@ --- * |
| 63 | * |
| 64 | * Arguments: @const char *sock@ = pointer to socket name |
| 65 | * @size_t *psz@ = where to write the address size |
| 66 | * |
| 67 | * Returns: Pointer to filled-in Unix-domain socket address. |
| 68 | * |
| 69 | * Use: Returns a Unix-domain socket address to use to find the |
| 70 | * passphrase pixie. |
| 71 | */ |
| 72 | |
| 73 | struct sockaddr_un *pixie_address(const char *sock, size_t *psz) |
| 74 | { |
| 75 | dstr d = DSTR_INIT; |
| 76 | |
| 77 | /* --- Get the default socket path if none specified --- */ |
| 78 | |
| 79 | if (!sock) |
| 80 | sock = getenv("CATACOMB_PIXIE_SOCKET"); |
| 81 | if (!sock) |
| 82 | sock = "%h/.catacomb/pixie"; |
| 83 | |
| 84 | /* --- Substitute interesting sequences in the path --- */ |
| 85 | |
| 86 | { |
| 87 | const char *q, *qq; |
| 88 | |
| 89 | q = sock; |
| 90 | for (;;) { |
| 91 | qq = strchr(q, '%'); |
| 92 | if (!qq || !qq[1]) { |
| 93 | DPUTS(&d, q); |
| 94 | break; |
| 95 | } |
| 96 | DPUTM(&d, q, qq - q); |
| 97 | q = qq + 1; |
| 98 | switch (*q) { |
| 99 | case 'u': |
| 100 | qq = getenv("USER"); |
| 101 | if (!qq) |
| 102 | qq = getenv("LOGNAME"); |
| 103 | if (!qq) { |
| 104 | struct passwd *pw = getpwuid(getuid()); |
| 105 | if (pw) |
| 106 | qq = pw->pw_name; |
| 107 | else |
| 108 | qq = "<unknown>"; |
| 109 | } |
| 110 | DPUTS(&d, qq); |
| 111 | break; |
| 112 | case 'h': |
| 113 | qq = getenv("HOME"); |
| 114 | if (!qq) { |
| 115 | struct passwd *pw = getpwuid(getuid()); |
| 116 | if (pw) |
| 117 | qq = pw->pw_dir; |
| 118 | else |
| 119 | qq = "<unknown>"; |
| 120 | } |
| 121 | DPUTS(&d, qq); |
| 122 | break; |
| 123 | default: |
| 124 | DPUTC(&d, '%'); |
| 125 | DPUTC(&d, *q); |
| 126 | break; |
| 127 | } |
| 128 | q++; |
| 129 | } |
| 130 | DPUTZ(&d); |
| 131 | } |
| 132 | |
| 133 | /* --- Allocate and initialize the socket address --- */ |
| 134 | |
| 135 | { |
| 136 | struct sockaddr_un *sun; |
| 137 | size_t bsz = offsetof(struct sockaddr_un, sun_path); |
| 138 | *psz = bsz + d.len + 1; |
| 139 | sun = xmalloc(bsz + d.len + 1); |
| 140 | memset(sun, 0, bsz); |
| 141 | sun->sun_family = AF_UNIX; |
| 142 | memcpy(sun->sun_path, d.buf, d.len + 1); |
| 143 | dstr_destroy(&d); |
| 144 | return (sun); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | /* --- @pixie_fdline@ --- * |
| 149 | * |
| 150 | * Arguments: @int fd@ = file descriptor to read from |
| 151 | * @char *buf@ = pointer to buffer |
| 152 | * @size_t sz@ = size of buffer |
| 153 | * |
| 154 | * Returns: --- |
| 155 | * |
| 156 | * Use: Reads a line from a file descriptor. The read is done one |
| 157 | * character at a time. If the entire line won't fit, the end |
| 158 | * is truncated. The line is null terminated. |
| 159 | */ |
| 160 | |
| 161 | void pixie_fdline(int fd, char *buf, size_t sz) |
| 162 | { |
| 163 | char *p = buf; |
| 164 | char *q = p + sz - 1; |
| 165 | |
| 166 | for (;;) { |
| 167 | char c; |
| 168 | if (read(fd, &c, 1) < 1) |
| 169 | break; |
| 170 | if (c == '\n') |
| 171 | break; |
| 172 | if (p < q) |
| 173 | *p++ = c; |
| 174 | } |
| 175 | *p = 0; |
| 176 | } |
| 177 | |
| 178 | /* --- @pixie_getpass@ --- * |
| 179 | * |
| 180 | * Arguments: @const char *prompt@ = pointer to prompt string |
| 181 | * @char *buf@ = pointer to buffer |
| 182 | * @size_t sz@ = size of buffer |
| 183 | * |
| 184 | * Returns: Zero if it worked OK, nonzero otherwise. |
| 185 | * |
| 186 | * Use: Reads a passphrase from the terminal or some other requested |
| 187 | * source. |
| 188 | */ |
| 189 | |
| 190 | int pixie_getpass(const char *prompt, char *buf, size_t sz) |
| 191 | { |
| 192 | const char *pfd = getenv("CATACOMB_PASSPHRASE_FD"); |
| 193 | int fd = 0; |
| 194 | |
| 195 | /* --- See whether a terminal is what's wanted --- */ |
| 196 | |
| 197 | if (pfd) { |
| 198 | fd = atoi(pfd); |
| 199 | pixie_fdline(fd, buf, sz); |
| 200 | } else { |
| 201 | struct termios ta; |
| 202 | struct termios ota; |
| 203 | char nl = '\n'; |
| 204 | |
| 205 | if ((fd = open("/dev/tty", O_RDWR)) < 0) |
| 206 | goto fail_0; |
| 207 | if (tcgetattr(fd, &ta) < 0) |
| 208 | goto fail_1; |
| 209 | ota = ta; |
| 210 | ta.c_lflag &= ~(ECHO | ISIG); |
| 211 | if (tcsetattr(fd, TCSAFLUSH, &ta)) |
| 212 | goto fail_1; |
| 213 | write(fd, prompt, strlen(prompt)); |
| 214 | pixie_fdline(fd, buf, sz); |
| 215 | tcsetattr(fd, TCSAFLUSH, &ota); |
| 216 | write(fd, &nl, 1); |
| 217 | close(fd); |
| 218 | } |
| 219 | return (0); |
| 220 | |
| 221 | /* --- Tidy up if things went wrong --- */ |
| 222 | |
| 223 | fail_1: |
| 224 | close(fd); |
| 225 | fail_0: |
| 226 | return (-1); |
| 227 | } |
| 228 | |
| 229 | |
| 230 | /*----- That's all, folks -------------------------------------------------*/ |
| 231 | |